Thank you for your answers. I will try to help give you some possible answers, but you might want to take Tiger to your veterinarian in the morning so they can do an autopsy (if you wish). They might be able to find some more clear-cut answers for you.

I think toxin or trauma would be lower on the list if Tiger is a strictly indoor cat. Sudden death can sometimes be the only sign in feline heartworm disease or heart disease in general, if they weren't in congestive heart failure. They can certainly throw a clot with heartworm or heart disease (something like a stroke). Sometimes respiratory disease can cause this, but I would expect coughing, sneezing, off food, or other symptoms if it was bad enough to cause death. If it was from chewing an electrical cord, there should be tell-tale sores in the mouth. If a clotting issue, there could be blood in other body cavities or bruises on the skin.

Yet again, words can't express how sorry I am for your loss. I hope this has helped, and if there are any further questions, just reply and I will get back to you as soon as possible.

I took Tiger to the Vet in order to do Autopsy and the explanation they supply was electric cord bite but it doesn't make any sense to me.

The only thing that was different in the last week was food from a new can (he usually eats dry food only) that was given to him twice once on Tuesday and once on Thursday and he was found dead on Saturday night when no one was with him in his last 24 hours so I don't know when the death took place.

When he was found there was seems that he has blood from his mouth near where he was laying (like asleep in one of his favorite sleeping location in the house). I tried to look on things on the internet and found the following links that both sounds close to what happened to Tiger

I am writing down the autopsy results I received from the Vet but pay attention that Tiger was taken to the Vet on Sunday morning when the death most probably took place sometime on Friday or Saturday so it took some time and as I have been explained several changes started to happened in the body due to the time that pass from the death.

The Autopsy results are:

"There were multiple areas in the tongue that were black discoloration either from hemorrhage or burn from an electric cord bite. There was evidence of bleeding from the eyes and gums. Internal abdominal and thoracic organs were also hemorrhagic, but there was no obvious compartmental bleeding. There was no obvious gross mass or tear in major vessel to explain the sudden death. The most reasonable explanation is an electric cord bite"

I am sorry for my long reply but I really want to understand the reason for the sudden death as I wasn't at home and was very attached to Tiger. I want to understand want went wrong.

I am sorry it took me so long to get back to you. I have been away for a few days. I looked at the links you posted, and I really think rodenticide poisoning is pretty unlikely. Unless you had rat poison set out somewhere in your house, there really is no way Tiger would have had access to it. I can't imagine the food was a major factor either.

Certainly, heart disease and saddle thrombus is a possibility. I would, however, have thought that they would have found an enlarged heart if that was the case. You can also visualize a clot in a vessel on the autopsy if you are looking for it.

A clotting problem is still a possibility, even though there was no free blood in any body cavity. They can get something called immune mediated thrombocytopenia, and you might not actually be able to prove it on autopsy. There usually isn't free blood in the chest or abdomen. Usually you see bruises, pinpoint bleeds in the eyes and in the mouth. Here is a link about this problem.

This can actually come on fairly quickly in some cases, and might have presented as sudden death, like you witnessed.

Electrical cord burn is not impossible, even though it may seem unlikely. Truthfully, I think it is more possible than a rodenticide poisoning. They don't have to be near the chewed cord, as some of the effects build-up and death can be delayed. If a cat were chewing a particular cord, the shock could cause small hemorrhages, frank bleeding and severe consequences for the respiratory and circulatory system. They may not occur or even be immediately apparent.

I wish I could give you some definitive answers, but unfortunately, you may never know exactly what happened. If you have more questions, just reply and I'll get back to you as soon as possible.

I will tell you that...the things you have to go through to be an Expert are quite rigorous.

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